Last change
on this file since 12 was
12,
checked in by basvannuland, 14 years ago
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Added RAP RDF API
Added RDF reader writer for save and load survey
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File size:
2.1 KB
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1 | <?php
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2 | // ----------------------------------------------------------------------------------
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3 | // Class: IteratorAllGraphsMem
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4 | // ----------------------------------------------------------------------------------
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5 |
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6 |
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7 | /**
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8 | * Implementation of a Graph iterator.
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9 | *
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10 | * This Iterator should be used in a for-loop like:
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11 | * for($iterator = $dataset->listGraphs(); $iterator->valid(); $iterator->next())
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12 | * {
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13 | * $currentResource=$it->current();
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14 | * };
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15 | *
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16 | * @version $Id$
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17 | * @author Daniel Westphal <mail at d-westphal dot de>
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18 | *
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19 | *
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20 | * @package dataset
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21 | * @access public
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22 | **/
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23 | class IteratorAllGraphsMem
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24 | {
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25 | /**
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26 | * Holds a reference to the associated RDF dataset
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27 | *
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28 | * @var object dataset
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29 | * @access private
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30 | */
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31 | var $associatedGraphSet;
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32 |
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33 | /**
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34 | * The current position
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35 | *
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36 | * @var integer
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37 | * @access private
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38 | */
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39 | var $key;
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40 |
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41 | /**
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42 | * If the current resource is valid
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43 | *
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44 | * @var boolean
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45 | * @access private
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46 | */
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47 | var $valid;
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48 |
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49 | /**
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50 | * The current NamedGraph
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51 | *
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52 | * @var obejct NamedGraph
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53 | * @access private
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54 | */
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55 | var $current;
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56 |
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57 |
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58 | /**
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59 | * Constructor.
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60 | *
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61 | * @param dataset
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62 | * @access public
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63 | */
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64 | function IteratorAllGraphsMem(&$namedGraphSet)
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65 | {
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66 | $this->associatedGraphSet=&$namedGraphSet;
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67 | $this->rewind();
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68 | }
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69 |
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70 | /**
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71 | * Resets iterator list to start
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72 | *
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73 | * @access public
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74 | */
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75 | function rewind()
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76 | {
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77 | $this->key = -1;
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78 | $this->next();
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79 | }
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80 |
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81 | /**
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82 | * Says if there are additional items left in the list.
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83 | *
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84 | * @return boolean
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85 | * @access public
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86 | */
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87 | function valid()
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88 | {
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89 | return $this->valid;
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90 | }
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91 |
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92 | /**
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93 | * Moves Iterator to the next item in the list.
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94 | *
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95 | * @access public
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96 | */
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97 | function next()
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98 | {
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99 | $this->current = &$this->associatedGraphSet->getGraphWithOffset(++$this->key);
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100 | $this->valid=($this->current!=NULL);
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101 | }
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102 |
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103 | /**
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104 | * Returns the current item.
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105 | *
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106 | * @return mixed
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107 | * @access public
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108 | */
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109 | function ¤t()
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110 | {
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111 | return $this->current;
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112 | }
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113 |
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114 | /**
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115 | * Returns the key of the current item.
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116 | *
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117 | * @return integer
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118 | * @access public
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119 | */
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120 | function key()
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121 | {
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122 | return $this->key;
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123 | }
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124 | }
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125 | ?> |
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